Sanding-machine.



G. M. WATTERS SANDING MACHINE.

APPLICATION FILED ocnza. 191s.

Patented July 9, 1918.

2 SHEETS-SHEET I.

GJM. WATTERS.

SANDIING MACHINE. APPLICATION FILED OCT. 23, 19:

Patented July 9, 1918.

2 SHEETS-SHE ET 2.

, GEORGE M. WATTERS, 0F MINNEAPOLIS, MINNESOTA.

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newness.

Specification of Letters Patent.

Patented July 2, 11918.

Applicationfiled October 23, 1916. Serial No. 127,042.

My present invention has for its object toprovide a simple and highly efficient machine for polishing, grinding, working, or finishing various difl'erent kinds of surfaces,

which operations are herein generallydesignated as surfacing operations, and the improved machine for accomplishing this work is styled a surfacing machine. Particularly, however, it is intended for use in sand-papering wooden floors.

Generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings which' the front portion of the machine;

Fig. 3 is a plan view of the machine; and

Fig. 4 is a detail in section on the line 4-4 of Fig. 2.

The machine may, of course, be made in various different sizes. It comprises a main frame 4 having depending lugs holding an axle 5 on which laterally spaced intermediate so-called fulcrumed wheels 6 are journaled. Projecting forward from the frame 4 are strong arms 7 that support a drum shaft 8 which carries laterally spaced surfacing drulns 9 to which sand paper 10, or other surfacing material, will be secured in any suitable way. As a feature of the invention, the drum shaft 8, instead of being directly journaled in the arms 7 is directly journaled in supplemental arms 7 that arepivotally connected to said arms 7 at their upper ends by a transverse rod 7 Stop screws 7 which work through lugs on the arms 7 limit the downward movements of the supplemental arms 7*. The said arms 7* are yleldingly pressed downward by coiled springsZ subject to adjusting screws 7 that work through lugs on the arms 7. The said arms 7 are provided with'slots 7 which permit upward and downward movements of the drum shaft 8.

Located between the drum 9 and secured to the front ends of the arms 7, by bolt and slide connections 11, are bearing brackets 12, the lower end of which carry a short spindle 13 on which front so-called gage wheels 14 are journaled. Here it may be stated that by vertical adjustments of the bearings 12, the sand paper faced drum 9 may be set for any desired cut.

On the intermediate portion of the drum shaft 8, is a pulley 14. A belt 16 runs over the pulley 15 and over a pulley 17 on the counter shaft 18, journaled in suitable bearings 19 located, as shown, on top of the main frame 4. This counter shaft 18, as shown, is driven through a sprocket and chain drive 20, from the armature shaft of an electric motor 21, secured on the main frame 4.

The main frame 4, at its rear portion, has an upwardly extended handle, in the form of a rigidly secured bail 22. The sanding rollers are covered by a shield 23 supported by the arms 7. The lower rear portions of the sand paper faced drum 9 works close to the segmental open front sides of suction spouts 24, which, as shown, are connected by a common spout 25 to an intake mouth of a fan casing 26 shown as suitably supported within the main frame 4. The discharge spout of this fan casing 26 extends rearward, thence upward, and thence downward and is connected to a dust collecting bag 27 Workin within the fan casin 26 is a fan head 28, t e shaft of which is riven from the counter shaft 18, through an ordinary belt and pulley drive 29.

The preponderance of weight of the machine is at the rear of the fulcrum roller 6, so that when the handle 22 is let go of by the operator, the said machine will tip backward and automatically raise the surfacing drum out of action and thereby prevent the grinding of depressions in a floor when the machine is left standing without stopping the motor; and when the machine is thus released, its rear portion will be supported by rear wheels or rollers 30 shown as journaled on a rear axle 31 secured to the rear lower portions of the depending side plates of the main frame 4.

Obviously, when the above machine is in operation, the dust from the rollers will be sucked up and carried into the dust collectin bag 27.

en the machine is in operation, it is pushed forward by pressure on the upper portion of the handle 22, and this force keeps the gage rollers or wheels 14 on the floor and the finishing rollers in action.

The springs 7 keep the surfacing drums yieldingly pressed downward to their work with the supplemental arms 7 pressed against the stop screws 7". Stop screws 7 prevent the surfacing drums from dropping into depressions, but the springs 7 will yiel to permit them to slide over outward bulges or projections in the floor or surface being smoothed or finished, and which are of such extent that they cannot be readily reduced by one operation of the surfacing drums.

What I claim is:

1. Afinishing'machine comprising a frame having a motor thereon, a finishing drum forwardly offset from said motor, a fulcrum roller between said finishing drum and motor, the preponderance of weight of the machine being at' the rear of said fulcrum roller, whereby the said finishing roller will be gravity tilted from operative position and not positively held to its work, and a gage mounted on said frame forward of said fulcrum roller for limiting the depth of cut of the said finishing roller, and a handle on the rear of said frame.

2. A finishing machine comprising a frame avmea ed on said frame forward of said fulcrum roller for limiting the depth of cut of the said finishing roller, said finishing roller being mounted in bearings that are vertically movable on said frame, adjustable stops limiting the/downward movement of said bearings in respect to said frame, and yielding devices normally pressing said bearings against said adjustable stops.

3. Afinishing machine comprising a frame having a motor thereon, a finishing drum forwardly offset from said motor, a fulcrum roller between said finishing drum and motor, the preponderance of'weight of the machine being at the rear of said fulcrum roller, whereby the said finishing roller will be gravity tilted from operative position and not positively held to its work, a gage mounted on said frame forward of said fulcrum roller for limiting the depth of cut of the said finishing roller, and means for inde pendently vertically adjusting or moving said finishingdrum and gage roller in respect to said frame.

4. Afim'shing machine comprising a frame having a motor thereon,-a finishing drum forwardly ofiset from said motor, a fulcrum roller between said finishing drum and motor, the preponderance of weight of the machine being at the rear of said fulcrum roller, whereby the said finishing roller will be gravity tilted from operative position and not positively held to its work, a gage mounted on said frame forward of said fulcrum roller for limiting the depth of cut of the said finishing roller, and a roller mounted at the rear of said frame and positioned to engage the supporting surface when, by gravity, said frame is rocked to raise said finishing drum from the supporting frame.

In testimon whereof I afiiX my signature in presence 0 two witnesses.

GEORGE M. WATTERS. Witnesses:

CLARA DEMAREs'r, F. D. MERCHANT. 

